Newborn babies crying at night may be caused by living environment, hunger, diarrhea, disease and other reasons. 1. Living environment problems: due to the living environment is noisy, harsh light in the house, there is an abnormal odor, etc., affecting the baby’s sleep, thus appearing at night crying. 2. Hunger, urination: due to the baby’s night hunger, or urination, resulting in the emergence of crying, after feeding, changing diapers will be quiet. 3. Disease causes: If the baby has fever, abdominal pain, vomiting, eczema, intussusception, neurological diseases, etc., it may cause the baby to cry at night. In addition, the baby’s lack of calcium will make the brain’s vegetative nerve function excited, thus appearing to cry. Newborn babies cry at night, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.